Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc179f838a73bef84cb6d1a4b29db35146d1d2d06c1cbce52376f4ef146a7e49' 
  AND token = 'kSsKRWts6Itot3BgBhYCF0HovH0SwWnaWsuXlQW1nSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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