Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71a7b560d2ac2061161bfd25a4c1d1b588d6af4a546bae71312fcdbfa4a57ad' 
  AND token = '9RLnzn/wtq9qdY3eMXfms5bYTBPaTwVOYoxkmWkDKwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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