Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff101d13875e9d6fd22c85b553272a6cb03ade7f01a895e5caa9ea46d6aeaba9' 
  AND token = 'JUonsr/GuOdqbrLQO6nkgb3Qe7UPi7Z6DEMYpzfJfxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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