Do I need to bind tables? Please help

Also it looks like there is a record for every form element, so not only is the time not unique, but by design there are multiple records with the same time.

It looks like you want a "select distinct submit_time" here, and join on that.  Check out the plug-in code - that's probably how they are doing it. Take their query and just join your table on the submit time.  see below

It's not ideal, but since you get very few submissions there's probably almost no danger of corrupt data or results.