Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea15478fb3d616171d7cee67ba0e5fbf03a1774c0f15d85026021422ad9fe0a1' 
  AND token = 'dWrJcW+3CoeNcUrMLfeBjdkQFpO8U0QQVjyRdQFqFoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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