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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66247498d7cc54080db4dcd55bd902d7e860e7167b4d435ef022f5815502978d' 
  AND token = '0rx2Rnp5S1n9o5s8tsIo/sv9d7pOLbRe6vPe/52Bj4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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