Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fadc847f85002d6ae2b6f39f672302d17d1644a47f853113993ad8083e16d81' 
  AND token = '4kcAp3sFmPwpVsso9C1MsnH80x8CZnmSnLvkRcf1Y5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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