Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794d6dc302fec839a648b3e52f8985cde24c804474c977d91ff18f5f4d0ab66b' 
  AND token = 'cfpCg+ZPkYTur8nZcZyD1TuCuB/kyN+EWzcpX+i9AFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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