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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd16bc907514e2082dc408d95f1b799bf1990e6c19c42790e8654d303c904f2cb' 
  AND token = 'CSwoApfo2KKhnynbqfpj0nMjopnczpre7Xt6/qu4+BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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