Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304dad283bbb5d144b4ea2a8b5e51a72668e64fc4eb41cbceb0cd726d2b34598' 
  AND token = 'q/DWI88pT8kpG2swSb3ijDUYK0PVS9vJdUzkMWwlK80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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