Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d5d539af053f215bd86d5c8440d65817d7c32084b56c01d673d28f3387f5db' 
  AND token = 'fn5tVUe+bP5cxt4ja7/Y2Vczne1bqev3yfaKCV6HyuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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