Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f991b454deb62c0a917d01ec4a7c1ea3e3af890cb1dc87504ec1c71b669ed2a' 
  AND token = 'WlZQC8EjYZ/EbmzjKNttRlbjVDg5W9KoS/88v0G/FoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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