Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ae74536f25f0cd48096c0e8a1e7012a9d6c5fe11600b6db1d34bdeff0bd1d8' 
  AND token = 'wZyidhcJVV3a7mjxCO8BcABW5CKlGyJxzpA0EHrofuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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