Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '20f2bb6d63c6f1d6f6ea078538f9fa88a6ab98e98744f5cd70368f8c017fac28' 
  AND token = 'KptUb4dznzmhw76Tb1T2aynYcbMUdQTxSJyY5P3gCxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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