Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a78a5793d0152dd7ea637b343b525d3cee6921b230c70123bc32a2ff9816e4' 
  AND token = '9z9SOJ2ACyYD0knsit4pZIq333rHkxLQ6Ay+SzQUBDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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