Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d5a40149b4238f9d4b8ac6fd0a1b92bcf92ec8698ad30c8eed5e33e1a246c8' 
  AND token = 'xC9Xf8u3h6dFmyNi+N/xSUZwLtCuytaUQC8V6nKh/7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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