Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b683a8619202dd87a2d48af0d6a280baac618b5e470bd79400d3b7764239f07' 
  AND token = 'SxwD/HMGA3UFLIRJM4283G6uj4WAktP49PD2hlJhrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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