Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c5391d368978e16fc34344fcdb6f4428ff5d86fbeaab0367393e479104e699' 
  AND token = '2ZKdlTvINsTGmCEhGCoq8cVIfKWciXPUM78WaB88pIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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