Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a3b56e6559267f59d3cf2d499f379021dc9bcab610af7c981880e2e0e24dde' 
  AND token = 'U8N4UaIgNn44g3S2wA4mE9v5WLfSBue+fPhGotqV4cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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