Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de86c97b04f69d3eb259ff1cfd5f3d08c8617ffdf89b924ac3e097ddf9f9f9c' 
  AND token = 'aG+aGNFFGV0PVf5iYAaOmfRkVHiICYIn2fU/zsQQhE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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