Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0bb117599d6d66f868add18ce6f9e49074d3ee5d12e556b669cdb0fb38cfc9' 
  AND token = 'TLq+pqa8KaMyiO4AeZKiaEY9duYpjHOjVxZu1u12EWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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