Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd481ed28ddd3c48b3f48db7d69a70d927b376dc4da0448a66f12ad21b3d282ea' 
  AND token = '3BXq3OseBugFIfHzMWQZ5l6AGgCwJxNwcLNzJ6DDLjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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