Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b623c0c98d8b9f6917c11dac503abaf50d5873574823bae9fdd220c1da2963c3' 
  AND token = '2vyFPb5M/vrzx6T8k6OxTz1rNeb0Lfc6jvNf9ZHA7RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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