Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574a54318bfe13c1aa7df681c08038e756ad21b84c8cce2c9045cc49cbf3b837' 
  AND token = 'e9n0If8hVOLmSnBQF5IGWD6BurzB5gf6P9w3GkbeQ5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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