Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c804aa697586e7ddb3464826ec42db8121beb779f6dedb08d42eb43d6ef602f4' 
  AND token = 'H9BByD90Z7WdScvMzO0ySbh1hqzej9RptnDQod3ak2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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