Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169dc53a2544ccb9d4cb1b6df112a3f5b20adcd7682bd7e774dcb0782a3c220a' 
  AND token = 'BqHZmwQcFK+COVlb6GHDl7tcqOKgc3+2DArDO3WQb7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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