WOW! You are right! You have *NO* INDEXES!
How do you manage to prevent duplicate INSERTs even into that one table???
Well, my remarks still stand.
Is your other table identical? That is, does it have the same field names and types? If not, maybe you need to use SHOW CREATE TABLE on it as well?
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.