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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd637dfa60bdaeedfbef3f0269774f38c0eb674bd2a8d170852446ecc8d543d1' 
  AND token = 'IXNCv1aQTO0/xAoJX/bq+xwGwesyIFFoAAvHZe3n6zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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