Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa81f5bb67e395d1a4795a4cc26d65a72bfe3d58d41087edd4d5fbdf4026290c' 
  AND token = 'nUkFgBMjiP1VwDJdipPjJQdfkoNP5tzzuSw9p5P83Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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