Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6eb0c75c925cdb05b97339449503bbff3e3918f1ffd139e4a79b6a96244179' 
  AND token = 'MgkXnKi6ct80Dz6eI39oLuyuYV1ORe6vkKVSmq63LWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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