Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695b68a55f645febaccd8fa9fee9c92bd5f5e8bded2550d24b18bd2a100ab8ba' 
  AND token = 'gJrsF3LsNffB3aL5sY+yrq6KkOKpUow6fd3kT7AMckI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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