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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '78eb4f884aaac41ff765ae16bddf00c08e24f7f583f78723c06cecb14ad10b47' 
  AND token = 'kcgfdrkjIRAExbs7znXpPtJGHTYiKCvLU8xlBN+soXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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