Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a06439a19d8e775381fb3f0c46d522d6a7476edf10d80abd52c7361ea53b3a2' 
  AND token = 'ftNcZ7+3ryHtssMd+XJKuzRUHidiXy7lBMhJVX1Lhk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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