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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07354893fbf1bedd75f9d20cb1dcc9f39ba68651b4fb63d9b06de0435ef027ee' 
  AND token = 'S3Hk/tU5NHnkSYZH/iOlZ+xwb8qEfP7E0FZIa5IZeiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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