That's assuming the key/value pairs are relatively small and unique. Unless I misread the OP, we don't know how much data is really involved or the complexity of it. (Remember that names can have 'special characters' or even a different character set.)
I agree with the other posters about performing a bulk load and using appropriate indexes. The optimizer in PostgreSQL (or any modern DBMS) is better suited for these types of data matches IMHO.
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