Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b36342ea9eb93fe228b3f752c046598339469e9b894b9765f07c942e1b531a' 
  AND token = 'QyY21nWDc+M5VTkfh06MuJUWcIrbZprWo223iuMwB5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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