Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28f92723804062ee5104747e1c1748010313d181e22e1037cc67de8f680e171' 
  AND token = 'KUyko4dQl/GI8v/N11/NiI7Ijlp6UmLne8x9yuyg6sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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