Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98c7db8005c92bb0dc05ffacf207c05d0be58f64c764e663a9bcbab3bb80916' 
  AND token = 'Dc2NCUAzgI+vjkZ8vv2s4T6JNKQbgmcLjPQV5N7xWHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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