Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305a92ad43167fc0af2561bb03237e6667b36ec78de01de7ebbbbbafe068ac2e' 
  AND token = 'bGsRoew71alazrpUxc97z5Kd5bOsTKQegbrnNfz6sgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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