Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a959c2812650f0b086060cc82138f9dc2690d7421810129d0ad8fabac156a14f' 
  AND token = 'S/viaRlrpFZS+2sPxV5SyHdfRakRFIuqa5REKf0Rqkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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