Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a8cb5ce3580b583ce934ddb8828912dd3061f04809e52d0b8aa224a75c10cb' 
  AND token = 'Q+gAhGmiHsGT7P2bDGQ+psYPIV2K6XRaKifeo2982Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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