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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '596d90d1879de1a533e8ec95b6fe589a4499e2ef509895a2d2c44427c530c78f' 
  AND token = '3ZTxNNYalXRzzUooab0SwGphdUo4DveTQgEljjeI1Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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