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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1f310d0e21747300690ff6e3b17968b0016b8bb072d4799f19ec4a78cec778fa' 
  AND token = 'K1Wr9eZBq80oXfEc3cMnEM1NZYe8dLHPOKKMl/1AS18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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