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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6073714627096c5940eb0d4e126a9e637c6a2642bc612e7c1f9af68d5ba90f32' 
  AND token = 'auaOHtofPEJnzVtptoshPOeTem3W9W6dC0namqAGBQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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