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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9088886e5029486715a1abe932d0caa18b8b014b8ee7de1eda6c0d56762f9cce' 
  AND token = '9QywjQhmjqN35uG7C7dLTMJ9oWEmUq1AFNtmYbs+GQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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