Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f3b2550a6050cd6b250d09ad861bd0bbbabe71d20fd0a51bcf79fd16e4fbd44c' 
  AND token = 'i64RlnfYL5ordcLvUHoXR/a83W/33v2vXiPN3NK/X7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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