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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '961382574ed388b74c1d4796513d3017b01bb5be99f10495e122bc0c37848290' 
  AND token = 'MWyNQLoRs46Pk0F0BguIPNzx/6sBZ1ui43K43YHYh3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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