Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589ac095ae1f36353236dffddb21c01959f958bde7880e03e1847caa266abe25' 
  AND token = 'RxCu1uvQDjUp00gWQLoNO0t8k9HyDIDxHbQ2regasEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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