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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0920f7457eeefa51421115a172e2bbd73a15db75ef57e797d407b31873ff699a' 
  AND token = 'QCRHco4xHfyq9A279w0g8MftjXXa3x7NrtDNDTzyKgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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