Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9579fb4c3c78a217198d8ea63945835d715dd0c113e63c1fd38b1b1bfbc4fb27' 
  AND token = 'DnvQc4QrWbSr3dnY9QaRRblGUoX93TdPmQmcQN+pNbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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