Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada7df8e360d7ed6f6110caf29eb28a0b77c9d7da267a6f9624e3945dd6c238e' 
  AND token = 'ZCTXDzokWeQFbPVKLZ/9dHGUK+lTRn33OMoeLT2aFak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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