Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa6f3529472fbc6521bfbf805b0cc2576fd36904220ad497a6a6ba191c1ded6' 
  AND token = 'OgPE9jY4Adqj+IgDSFnp52ehsn0hwjlAhzBeE1lzsYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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