Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df45d15f0ef1bc4ed1fabd47b2657072034309b5afad017814a16ce318ddebca' 
  AND token = 'wKmqag2IMSIRuiMKBL4/zdFwF1JtG4xDjrIhOEDoltY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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