Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a42f958bdac893d5cf7698f94cfa34a2cb8b26dc44fc06ca2a5cdc9b325de3' 
  AND token = 'lSFyflqWt3g5JE63uIk76saYWNWSgSnZeQFjfUGUYjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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