Don't try to put in a variable by fiddling with the template. TT has a method to do so. It's called the stash.
#!perl
use Template::Plugin::DBI;
$query = <<"EOQ";
select user
from logs
where user not like 'adm%'
EOQ
$tt = <<"EOT";
[% USE DBI('dbi:mysql:logs','','') %]
[% FOREACH item = DBI.query(query) %]
[% item.user %]
[% END %]
EOT
my $template = Template->new;
$template->process(\$tt, {query => $query})
or die $template->error();
This solution becomes quite obvious when one reads the docs.
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