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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58ed804719c79440c2f3e79be500e4f5dcbb29d7696e4be9304236211e7a7201' 
  AND token = '1xC6QxUzmGyksX3mTxmzT9wx1zk5wuZ4KvPEQ3ugXmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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