Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7db49627f80324d4474f5a30f1c48624f214c5e2777b52a7ef00e2848a3c93' 
  AND token = 'S14PnPVcCLjC3PjXc65V4Kz89AdWOhA5avYAQQGsyrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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