Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360288b430503150f8a26916c5cd2d8cf843eea72a394549cef0cbde20cf44c6' 
  AND token = '+hhchXAJYsEgYg5CLIhPvuMPdUiWRTVW3F8Yv4nnoH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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