Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c646572256873c57f1a5d04615a17dd16e26b0043552ac4304af87e32f78c4' 
  AND token = '8oLLYEhFLXeU5vKJTnwcLGqXORNf/raNNs97eHVanpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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