Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf8113d48198fc9404f5d84fb53e481d2334aa5969ef93dbcb05c78c9398c79' 
  AND token = 'RFiuKHVdcqsJ5wMlAAMbNC9s3q8Br8NZY/wcQuwZA3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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