Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b0cb6955c4b720bb6216e72fa9be8aab878b965d5a1c79038371d941fddd0f' 
  AND token = 'FNnrKGNO/1n9ZbejX7aGUPns88rzI3ISlwRCoFNdxGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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