Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50051dbf2ab8dbc73b1589fbe85b63670ba4d0d9a0af59658c65f10c7c27e8c8' 
  AND token = '03Nsgq76PYobGiFeV8pPMRP6Z7DVbmpnV03GPeiGuHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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