Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6f6676334d39ec9ff5a1f25dd61099bcbd9ee2d4e74611af48e97ef415a64c' 
  AND token = '91Rru3RLKMyaaTZdvOK7WhCPtze12PnWnKk1joErQ2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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