Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15596fb37164ad7f9c2ab5cbafa4127af772980f0f1f75c75089a321503a650c' 
  AND token = 'NY8mKDJXtF/3ywuAv1WJoiYrD0oVh4j8XN38Z72P/C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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