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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5958c96e98f67b61f18a81547c0d5fa1ed57ecf61b845a6563ef1e2b52142345' 
  AND token = 'wIbD/vEdO0Gdiim0y+pX1f8uQRzQCO/f0nzbdUvOgUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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