Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68e7d3759720f6ddd7ec491a5f0c29b957b5f1f9e76b374759b0090fe05e72f' 
  AND token = 'KqmenrOuuvREFafuIRZM+RY8JTFJ793YXw2SFTuqZ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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