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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2305e6ec85adc0d24844f18ef6166dec13750e029d408c14f8e03e5e8609c701' 
  AND token = 'S/DHDPgrW+x+xt/oWKcZ81m1dUidPoIpn0Q4d5nBaPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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