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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b3e424e1a111bf5b192a7a849850a46b995b3f2161f7c84eef8f803342d00302' 
  AND token = '41cNUW31gWfgLjJD+xrkOEkEDrTQAj2tCbI6WST7cJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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