If I'm understanding you correctly, the %emailOptions that you're passing to MIME::Lite::TT::HTML has essentially random keys, unknown until runtime. What you need is a key name with which to loop over the ticket info from %emailOptions. Can you modify %emailOptions to be:

my %emailOptions = {
   tickets => [
      { key => '<random ID>',   'queue' = 'Mig', 'priority' = 'high'},
      { key => '<random ID 2>', 'queue' = 'Inf', 'priority' = 'high'},
      { key => '<random ID 3>', 'queue' = 'Mig', 'priority' = 'low'},
   ],
};
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Then your template would include:

  [% FOREACH ticket IN tickets %]
     <td>[% ticket.key %]</td>
     <td>[% ticket.queue %]</td>
     <td>[% ticket.priority %]</td>
  [% END %]
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