Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42b2924c1f1f55456d0075f4f5773df5cbe0299b9ceec16a37002e125baf2f3' 
  AND token = 'k8IPaVhxpBEEGdmZVLqRU1OfPRdGiGdcSi19mTDPBaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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