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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '602573c9f791a8197f011e4b6cce87c2396efd8ac1cd0832bf327e7fdf5f7609' 
  AND token = 'eJO5ewaDl6xu21i/QTm4kG5+wKXAhvHXlgoc1GEfWbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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