Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9a2746fdfdbe16db90214407739a41fe5a11963f88d4d43d28ca89b1a4b5cb' 
  AND token = '7ru/C9WB0+tk7sWwm6A1b8p9UXT5q6aWbbHLbjH3qjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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