Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2bd2bab9cad27deb9d25ba6d189eb1f9d9c2f878b06aa53dc98ba8ca443f0c' 
  AND token = 'e5da5WASiU0cLtQN6k15a3CAsLh5nGO/T7MZSCj3ziA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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