Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb595b9af9524b36a2eefe538fc13c9b1457fb92a24b9797cef0a224826f9b37' 
  AND token = '52wi1WMgs4AUDI+xo7HTrH9mZ+1TIKwmGVLErJk0VEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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