Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815299625389f4012728dc9c69fd7b16cb92742016c9a78bc4e2668f102e6bf8' 
  AND token = 'N+hh3svBPSCHfHbeWuCZTNuTttqj5HxB0ziAzEu734U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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