Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d8c142c3e58765bd01d042385eaa6e9eb0cfca7e3ff9a9757eeb50304a9206' 
  AND token = 'KKJySaQKkUM9afcdpFKs6w42OlA8Rm5SGCsmHyE3k6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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