Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5ddbc60b2e1d52bc9b0cac2cd6a1f1f2d133d5097df3f941ea5febbce68f21' 
  AND token = 'IUOEVHvZoZnLYz0oBATNde/XuPSqWSjaflyKowZSD0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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