Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ba277f0b35d97c7707b8b5c42dc84fd7eb61c131625065fb7105eb796ce0ca' 
  AND token = 'nJqDGxO2idh4qRGTrQ+cDlI78fXiN+VHzrYOWfYYdJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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