Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6085b568254c65963341ecb589b9e00a3a07a02315cc70cacd9ef8ba370ed4d' 
  AND token = '1GMhNKs4F+GztIhFyen79Ph2LSkuhnnwHq+9qAsltog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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