Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c840ddf65ab89adc785a4899fb1c567833057c836fa09bd13520ee822137ac60' 
  AND token = 'uhBv1uwlGYUgoI3FXSxJEAMWIttDIfOhDf57UD1Wwe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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