Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c571bbb9f1f1e4c7b618174491dc41eb5f9b2790b7b7b77f03576bfe79f712b' 
  AND token = '+zlYUgfBOv2EJ34RBrAQZlOvusk4TC7Bh/0+vGe1aE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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