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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd795ab85e74db15402cf62d96b49dc572f6307006a62dea073c82c7c99cb5f9f' 
  AND token = 'Xy6P76UV0VnGw+zb7yGXbEu9uoajDyeIGFkLGYYeDC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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