Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b3dcc8f91eeff2439a2cf3febe17a077ebcd768f2605b6cf5d39dcb1e6f85f' 
  AND token = 'HYVgTvT5TBHkHzvzPPLreHmMpSW7V3pxAGMk3F2rDdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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