Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d83b1d8b4b26d0f628b90a121b4dcdd9ed616d2f5f8abb22439cb6407cd5f8' 
  AND token = 'N38ZGQir6AwdBOVlzbpVlBg5Dx+aFtZSrKhVBeM/Fdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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