Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e7a6103cbd0d2a05f21be9191bfee88735c97a77cb6afa0d91b1d2407bc4ce' 
  AND token = 'rUaPjEioMTsFGZvdRrJtIfE89Tm0GDLp2f8is12PV8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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