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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '40c9443c74dd0e7c3639aa665d8b9f9a77248a474595d1c047f564d9fb043225' 
  AND token = 'kSPU79MlRjJiL5JMDlVl5KIZj5blDvHEt+7zO2ON8VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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