Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ae709c4de0f5c31b94d99add518dbf1a3d830dc6a6a087ad1312e9a02a24fa' 
  AND token = 'QXbtFzhf9LvRQKF/uFVM7rhI7USpc/rcnEuH4rz1F7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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