Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6342431beaa81aef05a21f1a0f8fa50fefbadb86ca0caaf8c525c69ef4003a4c' 
  AND token = 'fTjq+ZNhYlLT5JiIyDFrfEgy1TJ5Za5IlffSEgwWGHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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