Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839c04dfb3c2d8091fa3fed3da561bddd4339e1fd483df038e4ffe04060c36e5' 
  AND token = '0oyNeLeHJcLXftW3oEvKZz273uX+0ZUDt2siueZO70E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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