Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ca02fa607614cadba38632eb103b4254845592f317b22ad41bf5686e464931' 
  AND token = 'lcLG/uMVGqkVyk8Hm/buHNOxIvdoTQgBLeBSCC6z9uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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