Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ef9aad0fdec7c9bd83f3b1ed0ccef4cd00d181ddad51368e0c909f19723457' 
  AND token = '4WR6rtIrzRQcaWrvODFGxAFcpGpDFFG/2KNc2HmakTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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