Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c900967602450919f7ccac903a6be1acb38ce811fe6c19354349a6fa37ac3874' 
  AND token = '3CNXjoOezIv5U29xol5c0qIhAdmfpRlgMvjFd2s602A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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