Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82aed6a1fdde1c707193422d804fbfb9a22f52ed7ed7e7f1efb6bf3ed96f3d7' 
  AND token = 'KSCJgjCXjPgs/6Di6CmjhN77gzasrZVXbZc6Ovkafik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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