Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ad98e59a3528b028e2bbee7b6ab19c388aed9fc21208ce6a39f8f27dcfeb8a' 
  AND token = 'QFg1kZIyybayychldOP+YQHWz+hseAPuhOqDQtyIphk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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