Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a878078e8d63acf5f67b21a5979c68e46c4a9b12cbbecb1083969d574e2e37' 
  AND token = 'ut+yJBrRFwzx+brL1US4M35oFoi0Jm0wMiSVnYkeFdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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