Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496ed60afa18a6b0e2ee9312c643b05f560a654918c599000cd1393513f4b25a' 
  AND token = '4cI/ufwLcedJHfyw4JBg8X4RrmWIqK47ZtynwqEt4Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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