Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489eaf948c76ec62e80caf195027efac632026a66a0a3e3d2f8eee6dae2c4987' 
  AND token = 's/molug85fhoKJg1KRMaAmjHjNI1qkKJj1bP5Da7GNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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