Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5814fc578a7ff3044e19f3d395e145836000c35cc3f5b20fd9dc5ac92648146' 
  AND token = 'BTHEvCzDDqUi2rhHN21qZw/cZw5H52SE8/yh/0/Lc8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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