Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1866012a29a3209e6e0c458717df23d5e10af4c53166b30228ba5185b4e1ee26' 
  AND token = 'n3vAasFry+HbXIY59wyOUz9mAPq2Low7KtxgeT+kw6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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