Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a2e5a684cffa15539efd781439af6b20a90ce8fb6d28e49d645781ee5bcac3' 
  AND token = 'fUutGrUHrA9mU31F26mhkzzVatoVAmnl0YOplnQUBTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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