Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c8d90e77ec8b2faef35b2f43ea753dc4848ef06f6923ef7aa256413e85e630' 
  AND token = 'pSllwCSB+n5Ih98ohEI5kn/mSEV3s4f13BGhhSnc7jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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