I believe MySQL has a native dump mechanism that will dump to CSV (which Excel can read). If not, it's a six lines of code with DBD::CSV

use DBI;
my $mysql_dbh = DBI->connect( ... mysql_dsn);
my $csv_dbh = DBI->connect( ... csv_dsn);
my $mysql_sth = $mysql_dbh->prepare( ...mysql_select_sql);
$mysql_sth->execute;
$csv_dbh->do("CREATE TABLE excelsheet AS IMPORT(?)",{},$mysql_sth);
[download]