Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a839f26b64463e81464343d7fe80128c40644a493f0b9914fd2e291ca9971a87' 
  AND token = 'CDzXcXGrlSlL32vT3H15gbUUiMJjBm8Vh40flAalQVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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