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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cf9fea8f6da6277a6a3fa6aea28a1eef14d8a1742cf6ce92915a4a6c2c61ca90' 
  AND token = 'yuQRl3DWtJ4c3XwbVr3YBHrXD9/TX68zEbdBpm6AvvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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