SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1270fe3e389db190c43372d3266ec2e237f5489ae17d7039dd2b8bc8b6120276' 
  AND token = 'caIPcsHRb9yQ30Y+UMK3DLx8u0XYBHnIA/ZGaq75hJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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