Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71955bd20fcdf3c4105f2404e17fc66593cb135cc3b85a68987949044dfa2354' 
  AND token = 'CmiklAMueLHvBLJMCtg6I6cdb2nBSrGWga1O0BLEjQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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