Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260b7fd3e4b57c90cd0ffe7ea3ddd9c207520f8c38848b4933bdfa2a45a9fa98' 
  AND token = 'DeE8Bs5lHRzqGozo2kA8LLjSA6QN7WMjRwzWiuiC6vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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