Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c815d3bd455e1e2ee4af14f192c087bb93face14d01488f48f316ea5bd75c1c' 
  AND token = '3vKd2XCm+7Z9iS/5vW4Cf+m+fDoq8gVu4RmVALY5qPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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