Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc2ed8778a89195dfa9b087d3d2df3e25424ee88c070463376c93f5f410aa52' 
  AND token = 'eDyXrp0ZaMbN8JdBvJzLXXxlcO2vQudzWBO0LKAcCYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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