Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8647c161653dd3bb6c9537d9012aa22fa050c0c3ebff40b367b3018383f758' 
  AND token = '4NFd60TaxtZlRnepUCTtLxytEQDbBbQK6Gy2pOpxiUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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