Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd748ca12271ef1e5b407b4dfcfc943768ee88c1b230f9d59d086b8f61116a4ae' 
  AND token = 'lkI9XkcfqVsV+fwhUi3RWn0q3UuSAz7Q4HYkyinbPzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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