Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5255e9d5f1a89dd255f13dff858b396df87aa8218774de1fe755f39e603d8b34' 
  AND token = 'Q3u6izIW4FyN0CSZj0ihdLrci8p/1HJ/xZj7/dNVwds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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