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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf0071c7b7bf980b4a4b4c95ef6f8d39cf4ca60986ad6a33ff1ae2d566f36079' 
  AND token = 'TIP0zh06IaVfxHHW0XImzvIcbrEIDCIUReVGtX/QQj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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