Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0c42916974dccc47d442fb2cf5dd712617a47fa7e97291e96ff82b08d72d4b' 
  AND token = 'ivVAzNIfgk/5cqT09hsegTm13ImMONikyyOdkQKXLrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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