Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970332f8ccfe62c54f749011781b721fd3582f5f370228f95db5b967155cb124' 
  AND token = 'rupmLsK0klxmajr2G/ud3ZmIuvHyMX7jTT76FNcye0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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