Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716df0cd20f83a309aa8dc966d15abb7ad2af21aa344aa2a413dec7fb8d670d8' 
  AND token = 'yI97xJLaQTPJMJnDXW7kOWh+qtjYfnurIMQi/J5Pkzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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