Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c1ffd219832fe5566c2c7493659385c6aadb72e209ffe1e6b2ab686653462a' 
  AND token = 'BTtgl2EfZ2tQ2TuUIGJRikjsLYkOw3MH9Ocqpe2B8E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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