Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9ba0e5dd1806c0d41e29863c32586681ed0f642ac3b3c7029e6960d9adf394' 
  AND token = '0SLFVpbl4bFFYsc+ZlatmvuaBOS+cSSob9ekj5PIuyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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