Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6560016df5c6704753d04f9e18240646d4504e4f340747f99229ea9d2d55e5b3' 
  AND token = '9PaySA9riGAET2Wxbu0Utfo7hnmwE3eRzuWwY0Y274o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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