Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8c373d4e3082fe5d6adade1a6c685bd6122597f6ef026a70fece0ed945dbdf' 
  AND token = 'ID50jjyEnyVkj8LbDvWgz4r66VSM2TUFdMa0H7qWX9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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