Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae379971e0e2e0bc8ec1a7c4c81bc3eb6e1d4443e86a8f444d27373d49d69728' 
  AND token = 'Nz/cp9vUwqz6uHswN6gIxnSN28cW7GZXgvXO1cc5Qk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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