Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c949101724391317b439edd412413b45716c2bde799da158aa0b492a1735be5' 
  AND token = '5z8pnO9F8ECFgwmUDDCMBwelOKTbr0amtcQapJS4cBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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