Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a60267794e52178d2661c24362f0523f20790842a68dba7d15a24b8d8be6ffe' 
  AND token = '0BiKlx1DHQ9EkOiSxap+Qm513POcQnFmLScQh3sZvaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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