Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f09acbbc31bd6dbe53aec98ecfd4266f4bff850261f360ecd1a74ea09d49a42' 
  AND token = 'dYQUnkCiFUFJLPemM5Aa5FLc9/KZ/oGqYKaG6nIvRJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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