Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7788e36ac81e16e23448262e5cd840e807b350be6ce35e95ed9c8ae39e5a48' 
  AND token = 'zrbgq5bUgsRWZlMA8Dev2R5Y05QUGv5GbmGSiNJDF9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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