Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7dd7da4b57211667e55d309effc72a5c9c814baa050bc36259fdc38a4d0a32' 
  AND token = 'EJsaTiWVbi75QKJ6Ckq2Vztat3MyhuULLDm9eY5hhug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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