Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441485f3ade1865a5ac09423de3ba12738df65491e9490df4acbb127370886cb' 
  AND token = '7ENj1lJdE7mHol6zztIylMb9RRl69iKxaAW/NhLBY70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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