Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4dfdc99c528e38c4e3e947ab9a0822dbef8ccc4d93a06fb3889bbdc1039725' 
  AND token = 'kxx2r+ul9hKFFKapzglEeAQCis99JtvUpICBTiwJFfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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