SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77c35694c21ec8fab91d788322c85d78193194377bc1bbd6abb0f6eb11000b20' 
  AND token = 'g3SjwMtvI4M16GBg34KF4+qOLqnHq6jNcUVKtQS6N/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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