Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1c242c6032a61cace21444e731f603b1980ac55493b050031ec3619e5cf9ee' 
  AND token = 'c9wVStijNG6U5B/ick3y5feu9mtiIrq5kYhvtMB3k8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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