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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca9d97dd68743660bfee0f041fb08a47c421bd8447ea4621881e0a68ea7872c1' 
  AND token = 'j6AO0siYWgtGoBIm3zNqN61xR5JHi4QNTjPPQvvEtm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}