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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '48a0fb7c6ae8510a6ae20d8536dc7d4d671ba78a96668b6ed8f08f702f36693e' 
  AND token = 'bpISoq8fa8oNjFP8gYb6nfcWGZ0oePcW8px8+S9RoJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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