Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed1cf32a985386f367df2b8bbbbcd135adae644c1c8a98073b6d5fcffde323a' 
  AND token = 'guRPj6wX5rN4OPqbMQBtYL1DPSAO5dkhMFlyfbv7DSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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