unpack was the key to this. I figured it out. The following code is working as expected. Thank you. Here's a snippet

#!/usr/bin/perl
use warnings;
use strict;
use IO::Async::Loop;
use Net::Async::CassandraCQL;
use Protocol::CassandraCQL qw( CONSISTENCY_QUORUM );
use DBI();
use DateTime qw();
use Getopt::Long;
use feature qw(say);
use MIME::Lite;
use File::Basename;
use Term::ANSIColor;
use utf8;
use Text::Unidecode;
use bigint;

my $database = "xxxx";
my $host = "xxxx";
my $port = xxxx;
my $user = "xxxx";
my $password = "xxxx";
my $mysqlTable = "xxxx";

my $dsn = "DBI:mysql:database=$database;host=$host;port=$port";
my $dbh = DBI->connect( $dsn, $user, $password ) || warn "Failed to co
+nnect to the database: " . DBI->errstr;

my $table = "accounts";
my $keyspace = "loop_non_hadoop_test";
my $loop = IO::Async::Loop->new;

my $cass = Net::Async::CassandraCQL->new(
   host => $host,
   keyspace => $keyspace,
   default_consistency => CONSISTENCY_QUORUM,
);

$loop->add( $cass );
$cass->connect->get;

my $sql = "SELECT `key` FROM `users`";
my $keys = &retrieveData($sql,1);
foreach my $get (@{$keys}) {
    my $hex =  unpack('H*', $get->{key});
    my $get_stmt = $cass->prepare( 'SELECT "accessedDt" FROM accounts 
+WHERE key =0x'.$hex )->get;
    my ( undef, $result ) = $get_stmt->execute( [] )->get;
    foreach my $row ($result->rows_hash) {
        my $key_find = ($row->{"accessedDt"});
        if (defined $key_find) {
            say "I found this date --- $key_find";
        }
    }
}


sub retrieveData {
    my $value;
    my $sth = $dbh->prepare($_[0]);
    $sth->execute();
    if ($_[1]) { $value = $sth->fetchall_arrayref({}); }
    else { $value = $sth->fetchrow_array(); }
    return $value;
}
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