Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15d5e841eb8d0881e35c911597fa534221799c20c4a96ebba3a2cadb8278c7b' 
  AND token = 'L+3UNKlyjEY9yv0EqAmdbiHUw6sCr8htK9tIqDG8TUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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