Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f114f1ac7ffc63796971e027af05aebb400ac3ba3c0556668d11712c16ac9093' 
  AND token = 'udMRquy20B/wJGLYdwnkyipL97FqHnBUQZ6Py5jDPhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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