Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463adb03734dbbc951508f37e2f448894a26314a461a375b62bd9ef3d5541eaa' 
  AND token = 'kmbxB6tMFed8Ru7ASxYvdDtmJI+UD/FRZSwrgnXBgJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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