Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612a68c49f8238059646c7312c288c1402846c7f89a932df986fb7852d246e8c' 
  AND token = 'OM/zf3Gr2eebF2q8MtSE41OqCMOSFRGc8As+E7mexBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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