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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd875b47aa0c18f07b4b36e419527153d65d3ef443ae8000c6b7b501432365176' 
  AND token = 'qpteJQGs6rnoczCVAgg5XuOEnEKrsQXR9PNnNP+H05o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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