Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255995fd622d29e943aab46323636ff1f835dda96d61f113a0230d44ee338596' 
  AND token = 'hDcCrWnM3gpVvxZV5dW6OvTAT4tTHZ3B1eR+HP2MvZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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