Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f56af18c9da965224a7e2251eef09e11c4d22b780f700bc2ab03ceaf2f13310' 
  AND token = 'OuOWcPdSHRITihQGErHL12T2B5j7MQe5VkLC2Fo+v+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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