Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657540c76a5dfa791a2dadd231f083bc29a9fed5fffdca4581bea8ac5853ad99' 
  AND token = 'lvI9AL+9bJRvZCKv6ov6lUbZ2pWxLheYLmpvq5/W6K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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