Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b617e43c1428f41e7ba2643433ea0b09dcbdee8400f0f51347ece496784fd6f' 
  AND token = '5UaaCL50IuTTAIZGC+ZW5NsD6pBkUPw7tXNkjsLtq34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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