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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd269ec197a6a4eac4578e13d4090ac5effd55dacf587f97db7955b3f5f52a0a6' 
  AND token = 'JA0PNsO8ZQqrHigobT2KRt1bUsG0+eUq01MY90r6F1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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