Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d34d55b236d3912dd8b569b3260854f29f3a1237aa5aa1d93ae69fdfe6f905b' 
  AND token = 'cYo6dCmHouK2SqTCm5rxF1kpugP3SjpKOpHS+NjXjVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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