Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6c28784acd3f0bd5b4a4557c71b3c04ab88e6dca2e3801deabcd4b03afdd6b' 
  AND token = '2UH1fanGBUpZjMVhbEtq1bPzgVyDcBOJaiYkIWdZmzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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