Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a700e7891c75799ac2a55817ec9527863cc02893a24b694c40a130ddd6af8d0' 
  AND token = 'Cs8QfMSEnY8ny1MkpxCetMV04dE2dAoDs64UWvD2fns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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