Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd39519280adca8d2369f153d99876e253f59a613a603892194310f887b384b0' 
  AND token = 'xAAd3wmDIrgR33NUAIrcRkO/U0ZXeIqjrGHH4rBLcqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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