Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c356c0e38bdb48ecb92b344a210243cac8755acf0f09dd5091d644ef5bd6050' 
  AND token = 'l6lae+CjW0AO+WEzBF88dxErXAMMdVmwv8C5YunE7h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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